<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        div{
            background-color: #8bc34a;
            width: 300px;
            font-size: 48px;
            color: blue;
            font-family: 楷体;
            font-weight: bold;
            font-style: italic;
        }
    </style>
</head>
<body>

<!--
font-size: 字体大小
color: 字体颜色
font-family: 字体样式
font-weight: 字体粗细
font-style: 字体是否倾斜
-->
<div>我是风儿你是洒，hello world</div>

</body>
</html>